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(No Model.) 2 Sheets-Sheet 1. E. WESTON.

DYNAMO ELECTRIC MACHINE.

No. 268,331. Patented Nov. 28, 1882.

Jizuentor:

N. PETERS mowmmm w. wimp u. c.

(No Model.) 2Sheets-Sheet 2 E; WESTON.

DYNAMO ELECTRIC MACHINE.

No. 268,331. Patented Nov. 28. 1882. F 92 fittest: Inventor.

N. PETZRS. Photo-L-lhoqnpMn Wnhlnglon, D. c.

UNITED STATES PATENT QFFIQEO EDWARD WESTON, OF NEWARK, NEW JERSEY, ASSIGNOl-t TO THE UNITED STATES ELECTRIC LIGHTING COMPANY, OF NEW'YORK, N. Y.

'DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 268,331, dated November 28, 1882- Application filed August 31, 1882. (N model.)

To all whom it may concern: Figure 1 is a top view of a machine with a Be it known that LEDWARD WESTON, a subcircuit-breaker ofthe kind described connected ject of the Queen of Great Britain. and resitherewith. Fig. 2 is a plan, and Fig. 3 a side dent of Newark, in the county of Essex and elevation, of the circuit-interrupter, both en- 5 State ofNew Jersey, have invented certain new larged. 55

and useful Improvements in Dynamo-Electric The upper portions of the field-magnets of Machines, of which the following is a specificathe machine employed in illustration are desigtion, reference being had to the drawings acnated in Fig.1by the letters AA. B is thecomcompanying and forming a part of the same. mutatoron the armature-shaft;OO,thebrushes IO My invention relates to dynamo-electric mathat collect the current, and D D stout wires 60 chines in which the field-magnets are energized that conduct the current from the brush-holder by a circuit derived from the main or armato the binding-posts ot' the machine. \Vires ture circuit; and itconsists in the combination, E E are taken from the main circuit at any underconditions hereinafter specified, with said convenient point and carried around the fieldderived circuit, of a manual switch for intermagnets A A. Their ends are brought out and 6 rupting the generation ofthe currentin the mamade fast to binding-posts c e, set in a plate, chine. F, of insulating substance. On the top or side In a machine in which the field is excited by of the field-magnet A, in close proximity to a circuit derived from the main a path for the the binding-posts c e, is fixed an insulating current is always provided, whether the exterslab or plate, Gr, upon which are mounted the 70 nal circuit be open or closed, the machine beseveral parts of a circuit-breaker. These lating active as long as the armature is rotated. ter consist of contact-pointsfj", screwed into To check the generation of current requires the material of the plate and connected with either the shifting or stoppage of the drivingthe binding-posts c 0, respectively. A bar or 2 belt, the removal of one or both commutatorplate, H, ot'hrass, is pivoted midway between 75 brushes, ortl'ieinterruption of the field-circuit. the points ff, and carrying or formed with These several plans are attended with many arms h h, projecting on each side in such mandifficulties, particularly so the last named, ner as to make cont-actwith the pointsff. The which, notwithstanding, is by far the most debar H has a handle, K, of insulating material,

sirable, mainly for the reason that it is the by which it is turned-from side to side and 83 quickest and requires less complicated niechthe connection between pointsff broken or anism for effecting it. established.

In a large and powerful machine, it the de- L is a coil of insulated wire, or it may be a rived or field circuit be interrupted while the stick of carbon, or any equivalent device that machineisin action,serious accidents arelikely offers a very high resistance to the passage of 8 H" to follow from the effects of the extra current, a current. The opposite ends of the coilL are for with the separation of the contact-points connected with the contact-points f f, respectis developed a powerful extra current or disively, so that when the circuit through the field charge that may rupture the insulation of the is interrupted by shiftin g the leverH there re- 0 field, and which is liable to produce injurious mains a path of very high resistance, but still sparks and shocks. In order to avoid this I capable of carrying the extra current or discombine with the field-circuit a manual switch charge that is developed, thus protecting the with an insulated handle, the contact-points of machine as well as the attendants from injury. which are joined by a circuit including a re- 1 am aware that with a circuit-breaker has 5 sistance-coil, that takes the extra current and been employed a resistance-coil or like device prevents the occurrence of all accidents. This bridging the opposite contact points. This switch is placed on an insulating-plate on one therefore I do not specif cally claim. of the poles of the machine, above the commu- Having now described my invention, whatI tator, and is constructed as shown in the acclaim, and desire to secure by Letters Patent,

companying drawings, whereis 10:)

1. In a dynamo-electric machine, the comon the frame or field-magnets of the machine, bination, with the main circuit, of a derived and a resistance'coii or equivalent bridging field-circu1t,2tmanualswitohor circuit-breaker the opposite contact-points of the switch, as

connected with said fie1d-circnit, and a resistand for the purpose set forth. 15 5 ancecoil or its equivalent bridging the oppo- In testimony WhereofI have hereunto set my site contact-points of the switch,ns and for the hand this 25th day of August, 1832.

purpose set forth. EDWARD WESTON.

2. In a dynamo-electric machine, the combination, with the main circuit, of a derived Witnesses: IO field-circuit,amanual switch or circuit-breaker HENRY A. BECKMEYER,

connected with said. field-circuit and mounted HENRY HILL. 

